hello everyone, I'm new and have always used Windows computers. Now I'm tinking about ordering an iMac. I've searched a lot about the new iMac's. Now I'm hesitating to order an iMac 27" i7. I've read a lot of topics with problems about the screen and ticking harddrives. Does everyone has these problems or are that indivudual cases? Sorry for my English... Thx everyone!